Sewing machine



Mme. 30, 1936. .o. RJHAAS SEWING MACHINE Original Filed April 21, 1932 5Sheets-Sheet 1 (Ittomegs June 3@, 1936. v 0 R HAAS I 2,045,644:

' SEWING MACHINE ed April 21, 1952 5 Sheets-Sheet 2 Original Fill'mnentor attorney;

June w, 1936.

5 Sheets-Shee t 5 3nnento1:

' (lttornegs o. R. HAAS SEWING MACHINE 5 Sheets-Sheet .4

Original Filed April 21, 1932 (Ittomegs 0. R. HAAS SEWING MACHINE 5Sheets-Sheet 5 Patented June 30, 1936 HTED STATES SEWING Otto R. Haas,North Beverly,

MACHINE Mass, assignor to United Shoe Machinery Corporation, Paterson,

N. l, a corporation of New Original application A 667,224. Divided andJersey pril 21, 1933, Serial No. this application September 28, 1935,Serial No. 42,665

9 Claims.

The present invention relates to sewing machines, and is herein setforth as embodied in a lockstitch outsole shoe stitcher of the typedescribed in the present inventors pending appli- 5 cations for U. S.patent Ser. No. 600,016, filed March 19, 1932, and Ser. No. 667,224filed April 21, 1933, the present application being a division of thelatter.

The object of the invention is generally to improve the constructionandmode of operation of the stitch-forming devices of a sewing machineand particularly to provide a lockstitch outsole shoe sewing machine ofthe type mentioned which is more efiicient, reliable and uniform inoperation as compared to prior sewing machines.

In the machine of the inventors prior application, Ser. No. 600,016, astopping mechanism is provided to stop the machine with the needle andawl disengaged from the Work, and with the take-up moved from a maximumthread retracting position to a position where a part of the needlethread is yielded up as the machine comes to rest. In that machine theslack thread yielded up by the take-up during the final movements of themachine is likely to be withdrawn from the work support as the Work isbeing removed, so that upon starting the machine on a new shoe, the endof the needle thread extends from the first stitch so far as to requirehand trimming with resulting waste of thread.

According to a feature of the present invention, means is provided in asewing machine arranged to operate in the manner just described, forpreventing the thread from being withdrawn after the machine is broughtto rest. In the present form of the machine, an additional movement isimparted to the take-up by connections to the stopping mechanism, sothat substantially no slack thread is provided when the stoppingmechanism has operated, and a complete seam will be formed whichrequires no hand trimming operation.

This and other features of the invention including certain novel andimproved thread break indicating devices and novel and improvedconstructions and arrangements of parts are herein described in thefollowing detailed specification, and are more particularly pointed outin the ap- 50 pended claims.

In the drawings, Fig. 1 is a View in front elevation of the sewingmechanism of a machine embodying the present invention with certainparts broken away or removed; Fig. 2 is a plan view partially in sectionand broken away on a reduced scale showing a part of the drivingmechanism for the machine; Fig. 3 is a sectional view of the sewingmechanism taken along the line 3-3 of Fig. 1; Fig. 4 is a sectional viewtaken along the line 4-4 of Fig. 1, of a portion of the mechanism shownin Fig. 3, indicating the thread cutter in cutting position; Fig. 5 is aview in side elevation .on a slightly enlarged scale and partly insection of the mechanism shown in Fig. 3, looking from the opposite sideof the machine; Fig. 6 is a plan view partly in section along the line6-6 of Fig. 5 showing a part of the take-up actuating mechanism; Fig. 7is a sectional view in elevation of some of the take-up parts shown inFig. 6; Fig. 8 is a side view partly in section taken along the line 88of Fig. '7, showing more particularly the relations of the parts uponthe occurrence of slack or broken thread; and Fig. 9 is a view similarto Fig. 8 showing the position of the parts during sewing.

Referring to the drawings, the frame of the machine comprises a mainbase 2, (see Figs. 1 and 2) a frame 4' anism and supporting a motor, anda frame 6 supporting the sewing mechanism. The motor drives the machinethrough a vertical shaft 8 arranged to rotate continuously while themotor is running. The mechanism in the base 2 and the sewing mechanismare driven by suitable gearing mounted within the frames fromthecontinuously rotating shaft 8 through a clutch comprising a drivingmember I0 (see Fig. 3) and a driven member I 2.

The sewing mechanism of the machine, as illustrated, is arranged tostitch the outsole to a lasted shoe, the shoe being operated upon beingindicated at M in Fig. 4 of the drawings.

The sewing mechanism is operated from a sewing cam shaft I6 rotated fromthe driven clutch member l2 through a pair of helical gears l8 and 20attached to the clutch member and to the cam shaft, respectively. Whenit is desired to stop the machine, the driven clutch member I 2 isdisengaged from the driving clutch member I 0 by a driving and stoppingmechanism comprising in part a bell-crank 22 secured to a shaft 24 inthe frame 4, and. rocked in a counter clockwise direction, as viewed inFig. 3 through the engagement of a bolt 26 on one arm of the bellcrankwith a cam slot 28 in a sleeve attached to the driven clutch member l2.The return move ment of the shaft 24 and the bell-crank 22 in aclockwise direction is prevented by a latch 30 which engages thevertical arm of the bell-crank and causes the clutch to containing thepower driving mech.

be disengaged by the action of the cam slot 28 on the bolt 26 in thehorizontal arm of the bell-crank 22.

The thread is severed at the end of a seam by a thread cutter indicatedat 32, of the same construction and mode of operation as that describedin inventors co-pending application for Shoe sewing machine, Serial No.651,803, filed January 14, 1933, in which a knife is projected againstand enters beneath the surface of the shoe sole while the shoe is heldin operative position, so as to sever the threads with the endsremaining in engagement with the work, as shown in Fig. 4.

After theoperations on the shoe are completed and the machine is broughtto rest, a new shoe having been substituted for the one on which theoperation is complete, the machine is again started by engaging thedriven clutch member I2 with the driving clutch member I0. To cause themovement of the driven clutch member against the driving clutch member,a power driven shaft 34 (Fig. 2) having a crank portion 36 connected bya pitman and other suitable means to release the bell-crank 22 from thelatch 38 is caused to rotate through one complete revolution by themanipulation of a starting handle 38.

The stitch forming and work feeding devices of the machine include acurved hook needle 48, a curved awl 42, a looper 44, a shuttle or looptaker 46, a main take-up 48, an auxiliary take-up 50, a thread finger52, a needle guide 54, a work support 56, a presser foot 58, and a feedslide on which certain of the stitch forming devices are carried. Thestitch forming and work feeding devices operate with a continuousfeeding movement to form a lockstitch seam, and at the end of theoperation, the stopping mechanism including the bolt 26 on thebell-crank 22 and the cam slot 28 in the driven clutch member I2 arearranged to bring the sewing mechanism to rest at a definite point withthe needle and awl disengaged from the work. To permit the stitchformingdevices to operate at high speeds, the timing is so arranged that theawl enters the work after the needle has withdrawn with its loop ofthread and while the needle thread is being interlocked with the lockingthread by the shuttle. With this system of timing, it is necessary tocause the looper to misloop the needle in bringing the machine to restafter the last needle loop has been drawn down into the work in orderthat the machine may stop with the needle free of thread and at a pointin the cycle of operations in which, when the machine is again started,the awl will enter the work before the needle.

The take-up operates to draw the needle loop with the locking threadtowards the work, and to set the stitch during the final threadretracting'movement of the take-up. The position of the lock between thethreads in the work is determined by the amount of thread withdrawn fromthe shuttle. All of the operations and mechanism thus referred to aresubstantially the same, except as hereinafter described, as in themachine of the inventors applications Ser. Nos. 600,0l6and 651,803.

At the end of the sewing operation after the thread cutter 32 has actedand the shoe is being moved away from the work support, the frictionalengagement of the ends of the threads and particularly the end of theneedle thread, indicated at 62, (Fig. 3) in the work tends to cause thethreads to be drawn with the shoe. The action of the needle threadtension, indicated at 64 is sufficient to prevent drawing an unlimitedamount of thread from the needle thread supply, However, with the use ofthe timing referred to, and" the present stopping mechanism, the maintake-- up is actuated during the final movements of the machine to giveup a certain portion of the thread. Due to the failure of the looper toloop the needle on the last cycle of the machine, a supply correspondingto the thread releasing movement of the take-up may be withdrawn fromthe work support with the shoe after severing the threads. As themachine is started on a new shoe, the'amount of thread attached to thefirst stitch, unless otherwise taken up, may be so long as to requiretrimming after the shoe is removed from the machine.

In order to prevent a substantial length of needle thread from beingwithdrawn from the work support at the end of a seam by frictionalengagement with the shoe sole, an extra movement, according to thepresent invention, as will be hereinafter more to the take-up during thefinal movements of the machine so as to bring it into a positionsubstantially the same as its position during sewing in which themaximum amount of thread is retracted. This position may be suitablyregu' lated to cause the exact amount of thread required for the initialstitch in a new seam to be retained on the Work support after the shoeisremoved.

The means for actuating the take-up 48 during; sewing comprises a camactuated lever 66, ful-' crumed on a shaft 68 provided with a gearsegment I0 on one arm cooperating with a segment '52 fixed to a shaft I4on which the take-up is secured. The shaft sleeve I6 (see Fig. 6)arranged to slide along an arcuate slot "I8 in the frame of the machine.The sleeve I6 is retained within the slot by a curved cover platesecured at its ends to the portion of the frame in which the slot isformed. The surfaces of the slot are arranged concentrically with theshaft 68 about which the segment 'I0 is oscillated, so that movement ofthe sleeve I6 supporting the shaft 14 will not cause the segment 12 tobe disengaged from the segment I0. During the sewing operation of themachine the sleeve I6 is retained at the upper end of the slot I8 andthe take-up 48 is oscillated by the shaft 14 in the usual manner. At theend of the sewing operation, a set of connections actuated from thestopping mechanism is operated to move the sleeve 16 towards the lowerend of the slot I8 causing the segment 12 to oscillate the take up 48 toa position substantially corresponding to the extreme position of thetake-up during sewing.

The connections to the stopping mechanism for causing the take-up to beretained in its maximum thread retracting position, as the machine isstopped, comprises the shaft 24 of the stopping mechanism, a block 82(see Figs. 1, 2, 3 and 6) mounted on the end of the shaft, a block 84mounted on a shaft 86 and coupled to the block 82 by a tongue and grooveconnection, a gear segment 88 (see Fig. 2) fixed to the other end of theshaft 86 and a segment 90 on one arm of a U-shaped lever 92 fulcrumedloosely on a horizontal shaft 94 at the back of the machine. TheU-shaped lever 92 is connected with a sleeve 96 surrounding the shaft 94and carrying an arm by means of a clamp bolt I00.

a pivot block I02 slidingly arranged on the upper end of a rod I04pivotally connected at its lower end to a pivot I06 of a toggleconnected for operating the sleeve I6.

The arm 98 carries fully described, is imparted I4 is rotatably mountedin a thread retracting 98 secured thereto The sleeve 16 is secured atits ends to a pair of links I08 and H0 (see Fig. 6), the link I08 beingloosely mounted on the shaft 68 for the take-up actuating lever 66 andthe link I I0 being mounted upon a threaded stud- I I2 supported by alug on the frame of the machine. The links I08 and H0 are connectedtogether between their ends by a shaft II4 to cause them to movetogether, and their position is controlled by the movement of the togglecomprising a link H6 and a lever H8. The lever H8 is mounted on a shaftH9 in the frame and is pivotally connected with the link II6 by thepivot I06 which passes through the lower end of the link I04. When therod I04 is moved upwardly by the engagement of the block I02 with a nutI20 on the rod I04 through the action of the connection to shaft 24 ofthe stopping mechanism in bringing the machine to rest, the alinement ofthe toggle links is broken (see Fig. 4) causing the take-up to move toits lowermost position. The connections are maintained in this positionby a compression spring I2I acting between one arm of the lever H8 and apivot I22 rotatably mounted in a portion of the frame 6 to provide asnap action to the toggle movements. The spring I2I surrounds a rod I24secured at one end to the pivot I22 and slidingly arranged in atransverse opening through a pivot I26 mounted in a downwardly curvedarm of the lever II8 against which the spring I2I bears. The toggle ismaintained in a definite broken position by contact of one arm of thetoggle lever I I8 with an adjustable set screw I21 threaded into a lugextending from the link H6. The final stopping position of the take-upand therefore the amount of thread to be employed in forming the firststitch on a new seam may be regulated by adjusting the set screw I21.

When the machine is started, the starting handle 38 being actuated tocause the crank shaft 34 to rotate, the sleeve 16 for supporting thetakeup shaft I4 is moved to the upper end of the slot 78. Theconnections for so moving the sleeve 16 comprise an eccentric I 28 onone end of the shaft 34, an eccentric strap I30 surrounding theeccentric, a link I32 connected between the eccentric strap and an armI34 fixed to one end of the shaft 94 on which the lever 92 is mounted.Rotation of the crank shaft 34 in starting the machine causes shaft 94to be rocked first in one direction and then the other and an arm I36secured to the shaft is caused to engage the upper end of the rod I04,forcing the rod downwardly to move the toggle comprising the link H6 andthe lever II8 into alinement. This movement causes the sleeve I6 to beshifted to the upper end of the slot I8 and to be held in this positionby the snap action of the spring I2I while the machine is in operation.

In the machine described, some of the connections which operatesimultaneously to move the sleeve 16 carrying the take-up shaft are alsoemployed to cause the looper to misloop the needle after the last formedstitch. These connections operate in the same way as described in themachine of the inventors applications, above identified, and arearranged to be operated from an arm I38 extending from the U-shapedportion of the lever 92. The arm I 38 carries a perforated block I40 inwhich the upper end of a link I42 slides and movement is imparted to thelink from the block by the engagementof the block with an adjusting nutI44 carried by the upper end of the link. Upward movement of the link I42 causes the path of movement of the looper to be shifted disks areheld in a position out of away from the path of the needle. The looperactuating connections are returned to normal sewing positions bydownward movement of the link I 42. The link I 42 is moved downwardly byan arm I46 fixed to the shaft 94 between the arms of the U-shaped lever92 and is rocked simultaneously with the movement of the arm I36 whichreturns the take-up to normal operating position.

To indicate by stopping the machine or otherwise, breakage of the needlethread as in the machine of the co-pending applications, an electricalswitch is arranged to be operated jointly by the main and auxiliarytake-ups. Due to the movements of the pivot shaft T4 of the main takeupon the machine frame, the switch and auxiliary take-ups are separatelymounted and additional connections are provided for operating the switchfrom the main take-up.

The thread break indicating switch shown in Figs. 6 to 9, comprises apair of rotatably movable segmental contact disks i 48 supported betweeninsulating washers #50 carried by a sleeve I 52 and a movable contactI54 mounted on the auxiliary take-up 56. The movable fiat spring contactI54 when brought into engagement with the disks I48 causes the currentto flow therebetween, and the disks I 48 are connected by a pair ofsliding contacts I56 with conductors I58 leading to a suitableelectro-magnetic device for actuating the stopping mechanism of themachine. The sleeve I52 carrying the contact disks I48 is rotatablymounted upon a shaft I60 mounted at one end in a slot in a plate I62secured to the machine and the auxiliary take-up is rotatably mounted atthe other end of the shaft. exerts a yielding tension on the thread anda spring I64 is connected from an arm of the takeup with the frame ofthe machine for this purpose. When the thread is broken or the tensionreleased, the auxiliary take-up will move the contact I54 towards thevertical portions of the contact disks I48, but will not causeengagement therewith unless the main take-up is in its extreme threadretracting position. The contact engagement with the contact I54 by aspring I66 connected between an arm I68 extending from the sleeve I52and the machine frame. The spring I66 acts to hold the arm I68 inengagement with a shoulder I10 on the frame and a portion of the armextends into the path of movement of the main take-up 48 so that themain take-up will engage the arm I68 only in the maximum threadretracting position of the take-up.

When the take-up engages the arm I68 the contact disks are moved into aposition in which the contact I54 may engage them. As the takeup movesto release the thread the arm I68 again engages the shoulder I10 causingthe arm to remain at rest during the remainder of the machine cycle.With this construction the movement of the take-up pivot I4 at the endof the seam does not interfere with the operation of the thread breakindicating switch.

The nature and scope of the invention having been indicated and aspecific embodiment illustrating the several features of the inventionhav ing been described, what is claimed is:

l. A sewing machine having, in combination, a work support, a presserfoot, a needle, 2. take-up movable during sewing to take up and give upthread as the thread is passed through the work, and means acting toprevent the thread normally given up by the take-up during sewing frombeing withdrawn with the work as the work is The auxiliary take-upremoved from the work support after the machine comes to rest.

2. A sewing machine having, in combination, a work support, a presserfoot, a needle, a take-up, means for actuating the take-up during sewingto take up and give up thread as the thread is passed. through the work,and means for causing the take-up to be moved as the machine is broughtto rest to a position in which the amount of thread taken up issubstantially the same as at the limit of the retracting movement of thetake-up during sewing.

3. A sewing machine having, in combination, a work support, a presserfoot, a needle, a take-up, a shiftable pivot on the machine for thetake-up, means for oscillating the take-up about its pivot during sewingto take up and give up thread as the thread is passed through the work,and. means for shifting the take-up pivot as the machine is brought torest to prevent the thread normally given up by the take-up duringsewing from being withdrawn from the work support.

4:. A sewing machine having, in combination, a frame, a needle, a maintake-up, a shiftable pivot on the frame for the main take-up, means foroscillating the take-up about its pivot during sewing to take up andgive up thread as the thread passes through the work, means for shiftingthe pivot for the main take-up at the end of the sewing operation, anauxiliary take-up, a shaft on which the auxiliary take-up is mounted, athread break indicating device, operated in part by the auxiliarytake-up and an arm connected to said thread break indicating device andarranged to contact with the main take-up to cause the indicating deviceto be operated by the joint action of both take-ups.

5. A sewing machine having, in combination, a needle, a main take-up, apivot for the main takeup, means for oscillating the main take-up aboutits pivot during sewing to take up and give up thread as the threadpasses through the work, an auxiliary take-up, a movable switch contactconnected for movement with the auxiliary take-up, a second contactyieldingly retained in a position where it will not engage the firstcontact but movable into engagement with said first mentioned contactfor indicating a thread break, and an arm mounted in a position to beoperated by the main take-up towards a position in which said contactsmay be engaged during a part of the movement of the main take-up andarranged to be held stationary in a position in which the contacts cannot come into engagements during the remainder of the main take-upstroke.

6. A lockstitch shoe sewing machine having, in combination, a worksupport, a presser-foot, a needle, a take-up, a pivot for the take-up, ashiftable block on which the take-up pivot is mounted, means foroscillating the take-up about its pivot comprising a driving segment andgear teeth connected to the take-up to take up and give up thread as thethread is passed through the work, and'means for shifting the blockrelatively to the driving segment to prevent the takeup from giving upthread. as the machine is brought to rest.

'7. A sewing machine having, in combination, a work support, a hookneedle, a needle looper, a take-up movable during sewing to take up andgive up thread as the thread is passed through the work, and meansacting when the machine is brought to rest to increase the amount ofthread taken up by the take-up and when the machine is started torelease the additional amount of thread taken up.

8. A sewing machine having, in combination, a

work support, a presser foot, a needle, a take-up movable during sewingto take up and give up thread as the thread is passed through the work,mechanism for starting the machine in operation, mechanism for stoppingthe machine, and connections actuated by the stopping mechanism toprevent the thread normally given up by the take-up during sewing frombeing withdrawn from the work support with the work as the work isremoved from the work support after the machine comes to rest, andconnections actuated by the starting mechanism to release the thread forcontinued operation of the machine.

9. A lockstitch shoe sewing machine having, in combination, a worksupport, a presser foot, a needle, a take-up, a pivot for the take-up,means for oscillating the take-up about its pivot comprising a drivingsegment and gear teeth connected to the take-up to take up and give upthread as the thread is passed through the work, a shaft on which thedriving segment is mounted, an arm rotatable about the shaft forsupporting the take-up pivot, and means for shifting the arm relativelyto the driving segment to prevent the take-up from giving up thread asthe machine is brought to rest.

OTTO R. HAAS.

